The RS4S Japanese Medaka Ricefish is a premium ornamental medaka line known for its refined coloration, selective breeding traits, and strong visual appeal in both aquariums and outdoor ponds. This strain is part of advanced Japanese medaka breeding projects focused on enhancing body form, sheen, and overall display quality. Hardy, adaptable, and easy to care for, RS4S Medaka are an excellent choice for hobbyists looking for a unique and high-quality ricefish.
Approximate Shipping Size: 0.5 inches
Appearance
RS4S Medaka typically display a clean, well-defined body shape with enhanced coloration and/or subtle metallic sheen depending on the line. Individuals may show slight variation, but overall selection emphasizes attractive contrast, refined structure, and improved visual consistency. Under proper lighting, their appearance becomes more vivid and defined as they mature.
Temperament & Behavior
These ricefish are peaceful, social, and active swimmers that thrive in groups. They naturally school in the upper levels of the aquarium and are highly visible when kept in groups of 6 or more. Their constant movement makes them an engaging and lively display fish.
Care Requirements
RS4S Medaka are extremely hardy and adaptable, capable of thriving in a wide range of freshwater conditions. They perform well in both indoor aquariums and outdoor tubs or ponds.
Tank Size: 10 gallons minimum
Temperature: 65–80°F
pH: 6.5–8.0
Hardness: Soft to moderate
Aquascape: Plants, floating plants, open swimming space
Tank Mates
Compatible with other peaceful species such as small tetras, rasboras, Corydoras, shrimp, and other medaka. Avoid aggressive or predatory fish that may stress or outcompete them.
Diet & Feeding
RS4S Medaka are omnivores that accept a wide variety of foods including high-quality flakes, micro pellets, and frozen or live foods. Supplement with baby brine shrimp and daphnia to support growth, activity, and overall health.
Quick Facts
Scientific Name: Oryzias latipes
Common Name: RS4S Medaka, Japanese Ricefish
Care Level: Easy
Temperament: Peaceful, Social
Diet: Omnivore
Max Size: ~1.5 inches
Tank Level: Top
Breeding: Egg Layer (easy to breed)
The RS4S Japanese Medaka Ricefish is a premium ornamental medaka line known for its refined coloration, selective breeding traits, and strong visual appeal in both aquariums and outdoor ponds. This strain is part of advanced Japanese medaka breeding projects focused on enhancing body form, sheen, and overall display quality. Hardy, adaptable, and easy to care for, RS4S Medaka are an excellent choice for hobbyists looking for a unique and high-quality ricefish.
Approximate Shipping Size: 0.5 inches
Appearance
RS4S Medaka typically display a clean, well-defined body shape with enhanced coloration and/or subtle metallic sheen depending on the line. Individuals may show slight variation, but overall selection emphasizes attractive contrast, refined structure, and improved visual consistency. Under proper lighting, their appearance becomes more vivid and defined as they mature.
Temperament & Behavior
These ricefish are peaceful, social, and active swimmers that thrive in groups. They naturally school in the upper levels of the aquarium and are highly visible when kept in groups of 6 or more. Their constant movement makes them an engaging and lively display fish.
Care Requirements
RS4S Medaka are extremely hardy and adaptable, capable of thriving in a wide range of freshwater conditions. They perform well in both indoor aquariums and outdoor tubs or ponds.
Tank Size: 10 gallons minimum
Temperature: 65–80°F
pH: 6.5–8.0
Hardness: Soft to moderate
Aquascape: Plants, floating plants, open swimming space
Tank Mates
Compatible with other peaceful species such as small tetras, rasboras, Corydoras, shrimp, and other medaka. Avoid aggressive or predatory fish that may stress or outcompete them.
Diet & Feeding
RS4S Medaka are omnivores that accept a wide variety of foods including high-quality flakes, micro pellets, and frozen or live foods. Supplement with baby brine shrimp and daphnia to support growth, activity, and overall health.
Quick Facts
Scientific Name: Oryzias latipes
Common Name: RS4S Medaka, Japanese Ricefish
Care Level: Easy
Temperament: Peaceful, Social
Diet: Omnivore
Max Size: ~1.5 inches
Tank Level: Top
Breeding: Egg Layer (easy to breed)
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